Sewing-machine



(No Models) 2 Sheets-Sheet 1.

' R. W. SCOTT.

SEWING MACHINE.

No. 395,005. Patented Dec. 25', 1888.

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(No Model.) 7 2 Sheets-Sheet 2. R. W. SCOTT.

SEWING'MACHINE.

Pa. 9 t d Dec. 2 1888.

Jrwemlnr JZoZarZ WASCOib 5y his vlt'tormeys 1 W Wo'b'mesaas UNTTED STATES PATENT QEETC Q ROBERT IV. SCOTT, OF PHILADELPHIA, PENNSYLVANIA.

SEWING=MACHINE.

' SPECIFICATION forming part of Letters Patent No. 395,005, dated December 25, 1888.

Application filed August 24, 1888. Serial No. 283,628. (No model.)

To a ur7L0712 it may concern.-

Be it known that I, ROBERT SCOTT, acitizen ofthe United States, and a resident of Philadelphia, Pennsylvania, have invented certain Improvements in Sewing-Machines, of which the following is a specification.

The object of my invention is to provide a double-stitch sewing-machine with an attachment whereby it is rendered available for the production of an improved trimming for fabrics of the general character forming the subject of J. D. Morleys application for Patent bearing even date herewith, Serial No. 283,611, and of the special character set forth in my application, likewise bearing even date herewith, Serial No. 283,627. in the manner hereinafter set forth, reference being had to the accompanying drawings, in which Figure l. is a side view of a sewingmachine with my improved attachment. Fig. 2 is an end view of the attachment. I ig. is a plan view of the same; and Figs. 1, 5, and (i are diagrai'ns illustrating the operation of parts of the machine.

My invention canbe applied to any sewingmachine having stitch-forming mechanism adapted to form two parallel rows of stitches some distance apart. In the present instance I have shown it as applied to a machine having aneedle-bar with two necdles r .r which operate in conjunction with two vibrating looper-hooks, y 1 the latter being carried by a rock-shaft, u, an arm, a, on which is connected by a link, a to an arm, I), on a second rock-shalt, 1', parallel with the lirst, this latter shaft having an arm, (l, which is acted upon by a cam, 1", on the main or driving shaft 9 of the machine, so as to impart arocking movement to said shaft 7'). This construction of machine, however, is in common use, and forms no part of my invention. v bed-plate of the machine, however, is a frame,

This obj ect'I attain.

adapted to a suitable bearing on the bed of the machine and carrying an arm, n, which terminates close to the needle 00 of the machine and has an opening serving as a guide for a thread; or, it may have more than one opening, so as to guide more than one thread, if desired. The face-cam acts upon one arm of a bell-crank lever, F, the other arm of which is connected to a slide, G, guided in a suitable bearing on the frame A, and forked at the outer end for connection to a pair of levers, I I, which are located in advance of the needles and are hung to a suitable pro jection on the head of the machine, one fork of the slide being connected to the lever I between the fulcrum of the same and the lower end, while the other fork of the slide is connected to the lever I at a point beyond the fulcrum of the same, the consequence being that as the slide G is reciprocated in either direction movement in opposite directions will be imparted to the two levers I I, which are provided at their lower ends with openings serving as thread-guides.

The face-cam i is so formed that the levers- I I will be moved from the position shown in Figs. 1 and l, where the ends of the levers are outside the line of the needles x, to the position shown in 5, where the ends of the levers are inside said line, and then to the position shown in Fig. 6, where the ends of the levers are outside the line of the needles, but are in a position the reverse of that shown in Figs. and I, the next movement of the levers being back again to the position shown in Fig. 5, and then again to the position shown in Figs. 1 and -I..

In making the trimming shown in my application above referred to the levers occupy the extreme positions shown in Figs. 4 and (i for a very short time only, preferably during On the i A, in. which is a bearing For a shaft, B, hav- 1 ing at the front end a worm-wheel, 7:, which I is operated by a worm, 71,, on the main driving-shaft'g ot' the machine, the rear end of the shaft I) having a composite cam, 1), comprising a 1. eriphera-l cam, i, and a side facecam, t. The peripheral cam acts upon an arm, k, which is secured to a rock-shaft, k,

y l l the formation of but two stitches, but occupy the intermediate position for a much longer time, so that after a cross-thread is bound into each of the parallel rows of stitches a number of stitches will be formed by the sewing mechanism before the cross-threads are again bound in by the same, so that said threads are laid at'an angle from one row of stitches to the other and cross each other in their passage.

The peripheral eam i of the composite eam D is such as to impart to the arm n a movement whereby its guide is carried hack. and forth in front of the needle .r, and in making the trimming shown in my said applieatiim the guide remains hut a short time inside the line of the needle and alonger time on the outside of said line, so as to form the loops or scallops on the edge of the trimming. It will, he evident, however, that the move ments of this lever, as well as those of the lovers I 1, will he altogether dependent upon =roek-shal't having a sumplementary guide arm acting in eonjunetion with one ot. the

the character of the trinnning to heln'odueed.

Having thus described my invention, I claim and desire to seeure hy Letters latent- 1. The eomhimttion, in a sewin ;-maehine, of stitch-formin mechanism having two needies for produeing two parallel lines of stitches, one or more thread-guides loeatedin front of the needles and swinging from one to the other, a supplementary threadguide swinging in front of one of the needles only, and mechanism for vibrating said threadguides, sulistantia-lly as specified.

The combination, in a threzul-guiding attaelunent for sewing-maehines, of a pair of levers formin thread-guides, with a slide hav- I i i in a forked end, one arm eonneeted to one lever on one side of the fulcrum and the other arm. eonneeted to the other lever on the other side of the fulcrum, and with means for reeiproeatingsaid slide, sul istantially as specilied.

The eomhination, in a sewing-maehine, of SDllICll-lOl'llllllg meehanism having two needles for n'odueing two parallel lines of stitches, a pair 01: pivoted levers forming, a duplex thread-guide in front of the needles, a forked slide for operating said levers, a

needles, an arm on said rock-shaft, a hellerank lever eonneeted to the forked slide, a eomhined peripheral and face cam for actuating said arm and lever, and wm-m-g'earing' wherehy the cam-shaft is driven from the main shaft of the machine, all suhstantiall as specified.

In testimon; whereoil have signed my name to this specification in ihe presenre of two sullserihing' witnesses.

ROBERT \V. SCOTJ.

Witnesses:

EDWARD M. RILEv, HARRY SMITH. 

